F1 layer critical frequency, foF1

Scalable foF1 values do not occur very frequently. In December and January, foF1 was only seen 5 percent of the time at either site. Throughout the following months, the occurrence steadily increases, until by April, foF1 can be scaled 45 percent of the time. A lack of common data makes the comparison of the two sites very sketchy indeed in December and January 1993. From February onwards however, more points are available, and the comparison reveals a systematic offset between the data, more points lying below the expected line than above. This can be seen most clearly from the plot of all the data. With such a small number of points, the gradient is influenced by the few values at the low frequency end of this graph.


Next page
Contents page
15/05/97 Chris Davis